package com.sky.interceptor;

import com.sky.constant.JwtClaimsConstant;
import com.sky.context.BaseContext;
import com.sky.properties.JwtProperties;
import com.sky.utils.JwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * jwt令牌校验的拦截器
 */
@Component
@Slf4j
public class JwtTokenAdminInterceptor implements HandlerInterceptor {
	
	@Autowired
	private JwtProperties jwtProperties;
	
	/**
	 * 校验jwt
	 *
	 * @param request
	 * @param response
	 * @param handler
	 * @return
	 * @throws Exception
	 */
	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
		//判断当前拦截到的是Controller的方法还是其他资源
		if (!(handler instanceof HandlerMethod)) {
			//当前拦截到的不是动态方法，直接放行
			return true;
		}
		
		//1、从请求头中获取令牌
		String token = request.getHeader(jwtProperties.getAdminTokenName());
		
		//2、校验令牌
		try {
			log.info("jwt校验:{}", token);
			Claims claims = JwtUtil.parseJWT(jwtProperties.getAdminSecretKey(), token);
			Long empId = Long.valueOf(claims.get(JwtClaimsConstant.EMP_ID).toString());
			BaseContext.setCurrentId(empId);
			log.info("当前员工id：{}", empId);
			//3、通过，放行
			return true;
		} catch (Exception ex) {
			//4、不通过，响应401状态码
			response.setStatus(401);
			return false;
		}
	}
}
